Comparison

Keyboard for Ai vs Sigmakey

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Keyboard for Ai

Features
Read full description

Type real math symbols into any AI chat app, note, message, or document — without fighting the iOS keyboard. The standard keyboard has no √, ∫, π, or Greek letters, so typing math on mobile is slow and clumsy. Keyboard for AI gives you a clean, categorized math symbol keyboard, so every symbol is one tap away. 7 SYMBOL PAGES • Basic — numbers, + − × ÷, ( ) [ ] { }, ≤ ≥ ≠ ≈, √ ² ³ π • Algebra — roots, superscripts & subscripts, ± · ⊕ ⊗, variable letters • Calculus — ∫ ∮ ∬, ∂ ∇ Δ, ∑ ∏, lim, log, ln, → ⇒ ∞ • Trigonometry — sin cos tan, sinh, arcsin, π τ °, e i • Logic & sets — ∈ ∉ ⊂ ∪ ∩ ∅, ∀ ∃ ¬ ∧ ∨, ℕ ℤ ℚ ℝ ℂ • Greek — full lower and upper case: α β γ … ω, Α Β Γ … Ω • Stats — μ σ Σ, ⌊ ⌋ ⌈ ⌉, gcd lcm mod CLEAN UNICODE OUTPUT Everything types as standard Unicode (x², √, ∫, π, ≤, α), so it pastes perfectly into AI chat apps, Notes, WhatsApp, and email — no broken LaTeX, no rendering glitches. WORKS EVERYWHERE Use it in any app with a text field, on iPhone and iPad. From high school through university — algebra, calculus, linear algebra, statistics, logic, and Greek. FREE & PRO The Basic page is free forever. Keyboard for AI Pro unlocks the advanced pages — Algebra, Calculus, Trigonometry, Logic, Greek, and Stats — with a 7-day free trial, then $1.99/month, cancel anytime. PRIVATE BY DESIGN What you type is never stored or sent to us. Keyboard for AI Pro is an auto-renewing subscription: $1.99/month after a 7-day free trial. Payment is charged to your Apple Account; it renews automatically unless cancelled at least 24 hours before the period ends. Manage or cancel anytime in your Account settings. Privacy Policy: https://aikeyboard-legal.keremarslan.workers.dev/privacy.html Terms of Use: https://aikeyboard-legal.keremarslan.workers.dev/terms.html

About

Sigmakey

This utility provides a specialized keyboard for typing mathematical expressions, including fractions, roots, and Greek letters, directly within any app. It supports LaTeX, Unicode, and image output, with on-device processing for privacy and speed.

Highlights
  • Full math keyboard layout
  • Two-dimensional cursor for exponents/numerators
  • Type LaTeX, Unicode, or rendered image
  • On-device typesetting, no network required
  • Symbol search, recent, and favorite symbols
Features
Read full description

Sigmakey is a math keyboard for people who need to type actual math, anywhere you can type at all. Fractions, exponents, roots, Greek letters, and matrices sit one tap away, and the cursor moves right into a numerator or an exponent, so scientific notation looks the way it should. - A full math keyboard layout that works in any app with a text field - A two-dimensional field with a cursor that steps into fractions and powers - Type LaTeX, plain Unicode, or a rendered image, whichever the app expects - Everything typeset on device, with no network - Search for a symbol, or grab a recent or a favorite Drop an equation into a note, a message, or a homework app without hunting through menus. Privacy Policy: https://docs.google.com/document/d/e/2PACX-1vTDX9pxPOlUJl_skVUHPi99mAw0y2B2BYd_v1mJkoF3xW3rlOcW5KlYd4t93MMbbGhctSTnBTy7d_l6/pub Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Keyboard for Ai4 screens
Sigmakey4 screens

Verdict

The call

The clearest difference is iOS requirement: Keyboard for Ai at 16.0 against Sigmakey's 26.0. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Keyboard for Ai sells 1 in-app purchase, starting at $1.99 per month and Sigmakey sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference · 7 level
Keyboard for Ai versus Sigmakey: the parameters behind the verdict, then further details
ParameterKeyboard for AiSigmakey
PriceFreeFree
Rating—2.0 (1 ratings) — better
Number of ratings—1 — better
AdsNoNo
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better26.0
Further details — not scored
Size10 MB13 MB
Age rating4+4+
DeveloperKerem ARSLANAndrii Bashta

In-app purchases

1 purchases

Keyboard for Ai

Subscriptions1
  • Keyboard for AI Pro7 Days trial$1.991 Month
1 purchases

Sigmakey

One-time1
  • Sigmakey Pro$9.99

Questions

Is Keyboard for Ai free?
Keyboard for Ai is free to download, with in-app purchases available.
Is Sigmakey free?
Sigmakey is free to download, with in-app purchases available.
Do Keyboard for Ai or Sigmakey have ads?
Neither Keyboard for Ai nor Sigmakey shows ads.

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